Distinguish Gemfile syntax and evaluation errors

Fixes #3783.

5 files changed, 16 insertions, 2 deletions

diff --git a/exe/bundle_ruby b/exe/bundle_ruby
index 9356d7ed8d..9bee595265 100755
--- a/exe/bundle_ruby
+++ b/exe/bundle_ruby
@@ -8,6 +8,8 @@ require "bundler/shared_helpers"
 
 module Bundler
   class GemfileError < RuntimeError; end
+  class GemfileEvalError < GemfileError; end
+
   class Dsl
     include RubyDsl
 
diff --git a/lib/bundler.rb b/lib/bundler.rb
index eacee447e0..d943df9342 100644
--- a/lib/bundler.rb
+++ b/lib/bundler.rb
@@ -96,6 +96,7 @@ module Bundler
     status_code(24)
   end
 
+  class GemfileEvalError < GemfileError; end
   class MarshalError < StandardError; end
 
   class PermissionError < BundlerError
diff --git a/lib/bundler/dsl.rb b/lib/bundler/dsl.rb
index 9df01fb905..2da9de4da1 100644
--- a/lib/bundler/dsl.rb
+++ b/lib/bundler/dsl.rb
@@ -33,7 +33,10 @@ module Bundler
       contents ||= Bundler.read_file(gemfile.to_s)
       instance_eval(contents, gemfile.to_s, 1)
     rescue Exception => e
-      message = "There was an error parsing `#{File.basename gemfile.to_s}`: #{e.message}"
+      message = "There was an error " \
+        "#{e.is_a?(GemfileEvalError) ? "evaluating" : "parsing"} " \
+        "`#{File.basename gemfile.to_s}`: #{e.message}"
+
       raise DSLError.new(message, gemfile, e.backtrace, contents)
     end
 
diff --git a/lib/bundler/ruby_dsl.rb b/lib/bundler/ruby_dsl.rb
index b29fc019a7..46587e98cf 100644
--- a/lib/bundler/ruby_dsl.rb
+++ b/lib/bundler/ruby_dsl.rb
@@ -4,7 +4,7 @@ module Bundler
       raise GemfileError, "Please define :engine_version" if options[:engine] && options[:engine_version].nil?
       raise GemfileError, "Please define :engine" if options[:engine_version] && options[:engine].nil?
 
-      raise GemfileError, "ruby_version must match the :engine_version for MRI" if options[:engine] == "ruby" && options[:engine_version] && ruby_version != options[:engine_version]
+      raise GemfileEvalError, "ruby_version must match the :engine_version for MRI" if options[:engine] == "ruby" && options[:engine_version] && ruby_version != options[:engine_version]
       @ruby_version = RubyVersion.new(ruby_version, options[:patchlevel], options[:engine], options[:engine_version])
     end
   end
diff --git a/spec/bundler/dsl_spec.rb b/spec/bundler/dsl_spec.rb
index fc31531602..00242f037f 100644
--- a/spec/bundler/dsl_spec.rb
+++ b/spec/bundler/dsl_spec.rb
@@ -81,6 +81,14 @@ describe Bundler::Dsl do
       expect { subject.eval_gemfile("Gemfile") }.
         to raise_error(Bundler::GemfileError, /There was an error parsing `Gemfile`: (syntax error, unexpected tSTRING_DEND|(compile error - )?syntax error, unexpected '}'). Bundler cannot continue./)
     end
+
+    it "distinguishes syntax errors from evaluation errors" do
+      expect(Bundler).to receive(:read_file).with("Gemfile").and_return(
+        "ruby '2.1.5', :engine => 'ruby', :engine_version => '1.2.4'"
+      )
+      expect { subject.eval_gemfile("Gemfile") }.
+        to raise_error(Bundler::GemfileError, /There was an error evaluating `Gemfile`: ruby_version must match the :engine_version for MRI/)
+    end
   end
 
   describe "#gem" do